Impact of Static and Dynamic Eccentricity on the Performance of Permanent Magnet Synchronous Machines with Modular Stator Core

This work aims to identify and analyze the impact of static and dynamic eccentric tolerances on relevant performance measures of permanent-magnet synchronous-machines with modular stator core (MPMSMs). A 24-slot 28-pole machine with U-shape stator modules is evaluated by means of the finite element method. Also, a non-modular 24-slot 28-pole machine is assessed to compare the sensitiveness of modular vs non-modular PMSMs. Electromagnetic torque, cogging torque, back-emf, and the radial forces acting on the rotor were analyzed. It was found that most of the evaluated performance indices are not influenced by eccentric tolerances. However, a few relevant variables are severely affected, which could potentially endanger the mechanical integrity of the machine.